| 2009- |
Visiting Professor, Centre for Advanced Spatial Analysis, University College London |
| 2001- |
Partner, S&W Urban and Regional Research, Dortmund |
| 2000-2003 |
Executive Director, Institute of Spatial Planning, University of Dortmund |
| 1996-2003 |
Professor, Faculty of Spatial Planning, University of Dortmund |
| 1991 |
Visiting Professor, Department of Civil Engineering, University of Gifu, Gifu, Japan |
| 1988-1989 |
Professor, Department of Civil Engineering, University of Tokyo, Japan |
| 1984-2000 |
Deputy Director, Institute of Spatial Planning, University of Dortmund |
| 1982 |
International Institute for Applied Systems Analysis, Laxenburg, Austria |
| 1977-1984 |
Project Leader, Institute of Spatial Planning, University of Dortmund |
| 1969-1976 |
Research Group Leader, Battelle-Institut e.V., Frankfurt am Main |
| 1966-1969 |
Teaching/Research Assistant, Faculty of Architecture, Technical University of Berlin |
| 1964-1966 |
Architectural Office O.M. Ungers, Berlin |
| 1958-1959 |
Architectural Office Deigert & Yerkes, Washington, DC, USA |